Now, a recent study from cardiologists at the University of Maryland, has shown that laughter may have a beneficial effect on the heart.

In exchange EMI was allowed to repackage earlier Beatles material as compilations which Brian Epstein had not permitted. In 1966 Klein bought Andrew Loog Oldham's share of the Rolling Stones' management though Oldham continued in his role as the band's producer until late 1967. The Rolling Stones
In 1965 Klein became the co-manager of The Rolling Stones.

Allen Klein (December 18 1931 – July 4 2009) was an American businessman talent agent and record label executive.